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data-ice="title">es6/observable/combineLatest.js</h1> <pre class="source-code line-number raw-source-code"><code class="prettyprint linenums" data-ice="content">import { isScheduler } from '../util/isScheduler'; import { isArray } from '../util/isArray'; import { ArrayObservable } from './ArrayObservable'; import { CombineLatestOperator } from '../operator/combineLatest'; /* tslint:enable:max-line-length */ /** * Combines multiple Observables to create an Observable whose values are * calculated from the latest values of each of its input Observables. * * <span class="informal">Whenever any input Observable emits a value, it * computes a formula using the latest values from all the inputs, then emits * the output of that formula.</span> * * <img src="./img/combineLatest.png" width="100%"> * * `combineLatest` combines the values from all the Observables passed as * arguments. This is done by subscribing to each Observable, in order, and * collecting an array of each of the most recent values any time any of the * input Observables emits, then either taking that array and passing it as * arguments to an optional `project` function and emitting the return value of * that, or just emitting the array of recent values directly if there is no * `project` function. * * @example <caption>Dynamically calculate the Body-Mass Index from an Observable of weight and one for height</caption> * var weight = Rx.Observable.of(70, 72, 76, 79, 75); * var height = Rx.Observable.of(1.76, 1.77, 1.78); * var bmi = Rx.Observable.combineLatest(weight, height, (w, h) => w / (h * h)); * bmi.subscribe(x => console.log('BMI is ' + x)); * * @see {@link combineAll} * @see {@link merge} * @see {@link withLatestFrom} * * @param {Observable} observable1 An input Observable to combine with the * source Observable. * @param {Observable} observable2 An input Observable to combine with the * source Observable. More than one input Observables may be given as argument. * @param {function} [project] An optional function to project the values from * the combined latest values into a new value on the output Observable. * @param {Scheduler} [scheduler=null] The Scheduler to use for subscribing to * each input Observable. * @return {Observable} An Observable of projected values from the most recent * values from each input Observable, or an array of the most recent values from * each input Observable. * @static true * @name combineLatest * @owner Observable */ export function combineLatest() { var observables = []; for (var _i = 0; _i < arguments.length; _i++) { observables[_i - 0] = arguments[_i]; } var project = null; var scheduler = null; if (isScheduler(observables[observables.length - 1])) { scheduler = observables.pop(); } if (typeof observables[observables.length - 1] === 'function') { project = observables.pop(); } // if the first and only other argument besides the resultSelector is an array // assume it's been called with `combineLatest([obs1, obs2, obs3], project)` if (observables.length === 1 && isArray(observables[0])) { observables = observables[0]; } return new ArrayObservable(observables, scheduler).lift(new CombineLatestOperator(project)); } //# sourceMappingURL=combineLatest.js.map</code></pre> </div> <footer class="footer"> Generated by <a href="https://esdoc.org">ESDoc<span data-ice="esdocVersion">(0.4.8)</span></a> </footer> <script src="script/search_index.js"></script> <script src="script/search.js"></script> <script src="script/pretty-print.js"></script> <script src="script/inherited-summary.js"></script> <script src="script/test-summary.js"></script> <script src="script/inner-link.js"></script> <script src="script/patch-for-local.js"></script> </body> </html>